Lavatory cistern



Sept. 3, 1935. A J GURCK 2,013,149

LAVATORY C I STERN Filed Jan. 10, 1934 Patented Sept. 3, 1935 Application January I0, 1934, Serial Neill 05,107

In the Netherlands Januaryg i, 1933 4 Claims. (01. 4-50) The invention relates to and has for its object to provide a lavatory cistern for flushing'two dilferent volumes of water at will with the aid of a siphon having its inlet at the bottom of the I cistern.

The invention is characterized by the provi- 'sio-n of a valve member adapted to be kept open manually after the siphon has begun to act, so as to. permit a greater quantity of water to enter the siphon than if the said member is released immediately after the starting of the siphon.

In order that the invention may be more clearly understood various embodiments thereof will now be described by way of example with reference to the accompanying drawing wherein:

Figures 1 and 2 are cross sections through a lavatory cistern showing an arrangement in which the siphon is started by the injection of water, the views showing the parts in two different positions.

Figs. 3 and 4 are views of an arrangement simi lar to Figs. 1 and 2 wherein a push button is used for starting the siphon.

Referring to the drawing in detail, the device according to Figures 1 and 2 includes a bent siphon l t below the inlet opening of which is arranged a nozzle 15 by means of which the water required for the starting or the siphon is injected. This water comes from a pressure chamber It, the bottom of which is partly formed by a rubber membrane ll. The outer edge of this membrane is clamped betweenthe guide piece lt, which is screwed on to. the bottom of the cistern, and a cap 20 which is screwed on to the said member l9 and is held in position by a screw 3i. At the periphery of its central aperture the saidmembrane l! is fastened to the member 2! by means of a threaded ring 22. This member 2| is suitably fixed to a perpendicular tube 23 which is provided with small holes 24 above the member 2|. The tube 23 is provided at the upper end with a nozzle l and at the lower end with a bored plug '25, the bore of which is normally closed by a draining screw which also serves forholding the rotatable ring 21 in position. This ring 27 is provided with holes into which protrude the prongs of a forked pull-lever 28 connected to the cap 29 by connecting members 29 and 3E). Diametrically opposite the wing 36 is another wing Mia which facilitates the screwing-on of the cap 20. The space below the membrane I1 is in continuous communication with the atmospheremoves between the two end positions shown in Figures 1 and 2. If this tube 23 moves upwards, V the water in the chamber I6 is forced through the ports 24 to the nozzle l5 and is injected into the siphon M.

Mounted on the nozzle I5, by means of the arms 33, is a ring 34 which supports a cylinder 35, unless the latter rests on the seat formed by the member I8. In the rest position shown in Figure 1 the upper edge of the cylinder 35 is located beneath the normal water level 36.

If the free end of the lever 28 is pulled, so that the water in the chamber 16 is injected into the siphon, as described above, and then immediately released so as to, lower the cylinder 35, then only the water between the level 36 and the horizontal plane Bl, determined by the upper rim of the cylinder 35, and the contents of the cylinder 35 will flow off, whereupon the siphon will immediately stop. If however the lever 28 is held in the position shown in Figure 2, so that, after the injection of the water, the cylinder 35 remains lifted from its seat, the larger volume of water will effect the flushing.

Figures 3 and 4 showa modification of the device shown in Figures 1 and 2 adapted to be actuated by means of a. push button. In this arrangement the cap 38 is provided with a tube 39 which leads to a push button of the type commonly used in lavatory flushing devices. The tube 40, withthe ports 24, is sealed at its lower end by a plug which forms one solid piece with a guide member 4! which has a cross-shaped cross section. If the water is pressed by means of the push button through the tube 39, thedevice is forced into the position shown in Figure 4. The member 42, fixed to the tube 4!], is provided with a ball valve 43 for evacuating the air in the space between the membrane of the push button and the membrane ll. If the connecting tube 39 is drained by releasing a screw provided on the push button, then the water which is still in the cistern will also flow out through the ball, valve 43 and the tube 39.

The threaded opening which receives the memher is has a sufficiently large diameter to allow the cylinder 35 to be passed through. Consequently, it is possible to assemble the whole apparatus outside the cistern and to centre the siphon shank M by means of a plug screwed into the threaded opening, in relation to the nozzle l5 which is mounted at a later stage. It

is important for the functioning of the siphon that the jet of water It will be clear that it is possible to make a. part of the cylinder 35 stationary and to actuate, by means of the membrane I! or by means of a push or pull arrangement, an annular slide valve or some similar sealing arrangement by means of which the connection between the small space and the remainder of the cistern can be kept open or closed at will.

With reference to this, it is here pointed out that the space within the cylinder 35, together with the space between the levels 36 and. 31, is to be considered as the smaller part of the cistern.

What I claim is:

1. Lavatory cistern for flushing two different volumes of water at will comprising a tank, a fixed siphon of the inverted U-type in said tank, a tube surrounding the suction part of said siphon up to a level lower than the normal water level in the tank, a valve member adapted to close the passage between said tube and the bottom of the tank, means to actuate said valve member, and for effecting the injection of water into the siphon during operation of the valve actuating means.

2. A lavatory cistern as claimed in claim 1 characterized in that said means to actuate said valve member includes a push button.

3. A lavatory cistern as claimed in claim 1 characterized in that said tube and valve members are connected and movable together.

4. A lavatory cistern as claimed in claim 1 characterized in that said means for injecting water into the siphon includes a diaphragm displaced by said valve actuating means.

ARNOLDUS J. GURCK. 

